Enter one rectangular floor or wall section and the tile size to estimate base tiles, waste tiles, and full boxes in US customary or metric units.
Quick answer: divide project area by one tile's area, round up, apply the waste allowance, then round up again. Exact layout, cuts, adhesive, labour, cost, and grout purchase quantity are excluded.
Openings and irregular shapes are not subtracted automatically. Divide the project into rectangles and plan each section carefully.
Wider grout lines generally increase grout use.
Extra tiles recommended for cuts, breakage, and installation waste.
Recommended Guidelines
• 5% — Experienced installer
• 10% — Standard installation
• 15% — Beginner DIY projects, complex layouts, or diagonal patterns
Enter the number of tiles included in one box.
Project Area
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sq ft
Tile Area
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sq ft
Waste Tiles
—
Grout Planning Index
—
Relative indicator only
not a purchase quantity
—
Total Tiles Needed
Waste allowance: —
📦 Boxes Required: —
Enter the project dimensions, tile size, and waste percentage to see the estimate.
Estimate disclaimer: This tile estimate is for planning purposes only. Actual tile quantities, cuts, breakage, box contents, grout or adhesive coverage, prices, labour, taxes, and installation conditions may vary. Confirm measurements, product specifications, and package quantities before purchasing.
This calculator starts with one rectangular floor or wall section. It converts the entered project dimensions and tile dimensions to the same internal unit, calculates both areas, and divides the project area by one tile's nominal area.
The result is a piece count, not just a material-area estimate. A theoretical requirement is rounded up to a whole tile before the waste allowance is applied, because a purchase plan cannot include a fraction of a tile.
On the same surface, a larger tile covers more area per piece and normally produces a lower tile count. A smaller tile covers less area per piece, so the number of individual pieces rises even when the project area does not change.
That comparison does not predict installation difficulty or appearance. It only shows how the entered nominal tile dimensions change the area-based count, waste-adjusted quantity, and full-box result.
Grout-line width does not enter the tile-count formula. Base tiles are calculated from project area divided by nominal tile area, without adding the joint width to an effective tile module.
The Grout Planning Index is a relative on-page indicator that scales with project area and the selected joint width. It is not a grout quantity, coverage estimate, bag count, or substitute for the grout manufacturer's instructions.
The calculator first rounds the area-based requirement up to a whole base-tile count. It then multiplies that integer count by 1 plus the entered waste percentage and rounds up once more to a whole tile.
Waste is a planning allowance for cuts, breakage, pattern matching, and possible future replacements. The calculator does not simulate individual cuts, damaged pieces, reusable offcuts, or the geometry of a chosen pattern.
A result such as 112.3 tiles becomes 113 whole tiles. If tiles per box is entered, the calculator then divides the required whole tiles by that package count and rounds up to a full box.
Tiles purchased is the full-box count multiplied by tiles per box. Extra tiles from boxes are the purchased pieces above the calculated requirement; they are not guaranteed leftovers because cuts, breakage, and repairs may use them.
The model treats the project as one rectangle and each tile by its nominal rectangular dimensions. It does not place rows, centre a layout, rotate pieces, reuse offcuts, or decide which edge cuts can be carried to another part of the surface.
Niches, corners, columns, outlets, borders, curved surfaces, stairs, and irregular boundaries can change actual use. Divide measurable areas into rectangles where practical, then choose a waste allowance that reflects the project rather than assuming the calculator has modelled those details.
Diagonal, herringbone, staggered, border, and multi-size patterns are not explicit calculation modes. Selecting a higher waste percentage can create a planning allowance, but it does not make the calculator simulate the pattern.
For a layout that depends on exact alignment, focal points, borders, or repeated cuts, use a scaled layout or installer takeoff in addition to this area-based estimate.
The calculator does not estimate grout volume, grout bags, thinset, adhesive, membrane, levelling compound, substrate preparation, labour, tax, delivery, or project cost.
It also has no price-per-tile or price-per-box input. Use the displayed tile and box quantities with the selected product's package information and current price, then estimate installation materials separately from manufacturer coverage data.
Each example below calls the same calculateTile() function used by the interactive calculator. The displayed results are not hand-calculated substitutes.
A 10 ft × 10 ft rectangle uses 12 × 12 in tiles, 10% waste, and 12 tiles per box. A selected 1/8 in grout line would affect only the separate relative planning index—not these tile quantities.
The production result is 100 base tiles and 110 tiles after waste. Full-box rounding produces 10 boxes and 120 purchased tiles, which is 10 pieces above the calculated requirement.
Keeping the surface at 10 ft × 10 ft but changing to 6 × 6 in tiles shows the piece-count effect of tile size. This example uses 10% waste and 20 tiles per box.
The same project area now requires 400 base tiles and 440 tiles after waste. The result is 22 full boxes and 440 purchased tiles.
A 9 ft × 10 ft rectangle uses 12 × 12 in tiles, 15% waste, and 12 tiles per box. The waste result is rounded to whole pieces before the separate box calculation.
The production result moves from 90 base tiles to 104 required tiles. Buying 9 full boxes supplies 108 tiles, leaving 4 pieces above the calculated requirement.
This page documents the production sequence used for area, nominal tile area, base-piece rounding, waste, and full-box rounding. The worked examples are generated by the production function. Review measurements, actual product dimensions, box contents, pattern requirements, and installer guidance before purchasing.
Enter project dimensions in feet and inches and tile dimensions in inches. Results are shown in square feet.
Simple straight layouts may use about 5%–10%. Projects with more cuts or obstacles may need about 10%–15%, while complex patterns may require more.
Enter the number of individual tiles supplied in one box. Packaging may display metric dimensions, imperial dimensions, or both.
Extra tiles from box rounding are not guaranteed leftovers. Some may be used for cuts, breakage, pattern matching, or repairs.
It multiplies the rectangular surface dimensions, calculates one tile's nominal area, divides project area by tile area, and rounds up to a whole base-tile count. Waste and full-box rounding are applied afterward as separate steps.
Tile size changes the nominal area covered by each piece. On the same surface, smaller tiles normally require more individual pieces and larger tiles normally require fewer, before waste is applied.
No. The production tile count uses project area divided by nominal tile area and does not add grout width to the tile module. Grout width feeds only a relative planning index, not a grout purchase quantity.
The area-based requirement is first rounded up to a whole base-tile count. The waste percentage is applied to that integer count, and the result is rounded up again to a whole tile.
Tiles and unopened boxes are discrete purchase units. A fractional theoretical requirement cannot satisfy the estimate, so the calculator rounds up at the base-tile, waste-adjusted tile, and full-box stages where applicable.
Enter the number of individual tiles in one box. The calculator divides total required tiles by that package count and rounds up; it does not use an area-per-box input.
No. It returns tile and box quantities only, plus a relative grout planning index when grout width is entered. Material coverage, labour, tax, delivery, and price are outside the calculation.
The calculator does not create an exact cut layout. Irregular boundaries, niches, obstacles, pattern direction, damaged tiles, reusable offcuts, box contents, and installation decisions can all change the final quantity.
